Metal-shears



(No Model.)

G. MODONALD.

METAL SHEARS No. 311,999. Patented Feb. 10,1885.

INVENTOR:

7 BY ATTORNEYS.

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GILBERT MCDONALD, OF AUGUSTA, KANSAS, ASSIGNOR TO HARTFORD M. MEREDITH,OF SILVER CITY, AND JAMES A. LUCAS, OF GEORGETOlVN,

TERRITORY OF NEW MEXICO.

METAL-SHEARS.

SPECIFICATION forming part of Letters Patent No. 311,999, dated February10, 1885.

(No model.)

To all whom it may concern:

Be it known that I, GILBERT MCDONALD, of Augusta, in the county ofButler and State of Kansas, have invented a new and Impro edMetal-Shears, of which the following isa full, clear, and exactdescription.

My invention is an improvement in the class of hand-shearsfor cuttingmetal in which a plain and eccentric lever are combined and connectedwith the movable jaw for acting on the latter with great force.

The invention consists in the construction and combination of parts, ashereinafter de scribed and claimed.

Reference is to be had to the accompanying drawings, forming part ofthis specification,

' in which similar letters of reference indicate corresponding parts inboth the figures.

Figure l is a side elevation of my new and improved shears, showing infull lines the levers in the positions they assume for raising oropening the movable jaw, and in dotted lines the position they assume inclosing the movable jaw; and Fig. 2 is a detailed plan view of a part ofthe shears.

A represents the stationary jaw,fixed in the main frame B of the shears.

G represents the movable jaw, pivoted at a to the main frame B, and Drepresents the eccentric lever, pivoted at b, and E represents the plainor hand lever, pivoted at c to the forward extension, 'B,.of the mainframe B, and coupled to the eccentric lever D by the S-shaped yoke orcoupling F. The free end of the movable jaw 0 moves between the uprightportion B of the main frame B and the upright side piece, G, and theeccentric lever D is pivoted between these said upright pieces B G, sothat the eccentric portion D of the lever D will act upon the upper edgeof thejaw C, as will be understood from Fig. 1, and the tie strap orbrace H is provided for strengthening the upright plate G, and also themain frame B, and the jaw O is connected with the eccentric portion ofthe lever D by the cord or small chain I, so that when the levers D Eare turned to the position shown in full lines in Fig. l the cord orchain I will act to raise the free end of the jaw O, and a smallfriction-roller, d, is fitted in the upper edge of the jaw G, to reducethe friction of the eccentric lever D upon the jaw C.

Any sliding coupling may be used for connecting the lever E to theeccentric lever D; but I prefer to employ the S-shaped coupling-plate F,which is attached to the lever E by the bolt 0, and held to the lever Dby the bent rod J, over which one loop of the coupling-plate F reaches,as shown clearly in Fig. 2, the bolt f being passed through the loopwithin the bent rod J, and upon the bolt fis placed the friction-rollerg, which acts to reduce the friction of the coupling F with the back ofthe lever E, and the lever E is by preferenceformed with the socket c,to receive the separate extension E, which may be removed and replacedat will, and which may be of anylength desired, according to the powerrequired.

The action of the shears is obvious from the drawings. By swinging thelever E from the position shown in full lines in Fig. 1 to that shown indotted lines, the connection F will cause the eccentric lever D to becarried downward, bringing its eccentric portion D upon the upper edgeof the jaw C, which will force it downward with great power, causing itto cut whatever may be placed between the jaws of the shears-and byswinging the lever E back to its original positionthat shown in fulllines-the roller 9 of plate F, acting against the bent rod J, will raisethe eccentric lever D and cause the cord or small chain I to raise thejaw C.

The arrangement of the eccentric lever D and plain lever E furnishes apowerful leverage for operating the movable jaw C, so that the shearsare adapted for hand use and for cutting heavy bars or plates of iron.Besides, the shears are practical, strong, durable, and cheap.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The eccentric lever D, connected to and 5 adapted to act upon the jawO, and provided with the be nt rod J, in combinatiOIl with the coupledto lever D by a bentpiate, F, of the lever E, pivoted in front of thepivot of the antifriction roller g, substantially as shown lever D, andcoupled thereto by the sliding and described.

or shifting coupling-p1ate F, substantially as GILBERT MCDONALD. 5 andfor the purposes set forth. \Vitnesses:

2. The combination, with the eccentric ]e- W. A. SHANNON,

Ver D, having a bent rod, J, and theiever E, C. I. PUGH.

